PLATE LXIIL 



ARCA NUCLEUS. 



SILVERY ^RK. 



GENERIC CHARACTER. 



Animal Tethys ? Shell bivalve, equivalve. Teeth cf the hinge 

 numerous, inserted between each other. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Small, somewhat triangular, smooth, silvery witliln. Hinge semi- 

 circular, beset with numerous plate-like teeth. Margin finely ere- 

 nated 



Arca Nucleus : testa oblique ovata Iffiviuscula, natibus incurvis, 

 margine crenulato, cardine arcuato. Linn. Sj/sL 

 Nat. p. 1143. A'^o. 184. 



Arca Nucleus : testa oblique ovata Igeviuscula : cardine triangular!. 

 Gyncl. Linn. Sj/st. Nat. p. 3314. sp. 38. 



Tcllina inaequilatera, margine interno minutissime dentato, sed prope 

 cardinem denticulis spissis, elatoribus, acutis, con- 

 spicua, oleagina, intus argentea. Gualt 1. 

 Conch, tab. Si, fig. IL 

 c 2 



